Purlin arrangements



Jan. 16, 1962 M. ROSEN PURLIN ARRANGEMENTS Filed April 24. 1959 R. Y 0 z T a N 2 i m we r 1 V7 A y L m M 3,916,995 Patented Jan. 15, 1952 3,016,995 PURLIN GEMENTS Milton Rosen, Kew Gardens, N.Y. (Lake Shore Drive, Lake Mohegan, N.Y.) Filed Apr. 24, 1959, Ser. No. 808,851 Claims. (Cl. 189--36) The present invention relates to improvements in steel constructions of buildings or the like and, more specifically to a new and improved arrangement of securing purlins to girders in steel construction, this arrangement being especially well adapted to the ordinary concrete flooring supported upon steel I-beams or similar supports.

One object of the present invention is the provision of a purlin arrangement of the character described which will elminate most of the shop and field labor associated with securing purlins to girders in steel construction, such as the attaching of connection angles to the purlins in the shop, and bolting or welding the purlins to the girders in. the field, thus greatly reducing the actual construction time and expenses.

Another object of the present invention is the provision of a purlin arrangement of the character described which allows to tranfer the load through the top flange into simple connection elements attached to the girder, which consists of an I-beam or the like.

A further object of the presentinvention is the provision of a purlin arrangement of the character described which is simple and easy to carry out and which will result in a secure and reliable fastening of the purlins to the girders.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangements of parts without departing from the spirit of the invention as claimed.

In the accompanying drawing a preferred form of the invention has been shown.

In said drawing:

FIGURE 1 is a fractional cross-sectional View of a preferred embodiment of my invention on the line 1-1 of FIG. 2;

FIG. 2 is a fractional bottom plan view of the same; and,

FIG. 3 is a fractional sectional view on the line 3-3 of FIG. 1.

Similar reference characters refer to similar parts throughout the several views.

In the drawing the numeral 1 denotes girders consisting of steel I-beams having flange portions 2 and 3 and web portions 4. The purlins 5 may consist also of steel I-beams, or of T-bars which may be more advantageous in certain cases. Thus, in any case each purlin 5 has at least one (top) flange portion 7 and a web portion 10. If the purlins 5 consist of steel I-beams, as in the instance shown, lower corner sections of the web portions 10 as well as of the lower flange portions 11 are cut off, so as to form corner recesses 12, as may be seen in FIG. 1. These recesses 12 can be formed at the steel mill, simultaneously with the cutting of the purlins 5 to the desired length. Thus the purlins 5 can be delivered ready for installation, directly from the steel mill to the building site. Pairs of connection elements 15 and 17 are secured to the top flange portion 2 of the girders 1 by any suitable means, and the elements 15 and 17 are in spaced relation to each other, so that those sections of the web portions 10 of the purlins 5 which are above the recesses 12, can be inserted there-between. The elements 15 and 17 may be comparatively short members shaped as U- shaped channel members as the elements 17, or as tubular members as the elements 15 which preferably are square in cross-section as shown. The cross-sectional forms of the members 15 and 17 as shown in the drawing ofler large horizontal areas for the flange portions of the purlins 5 to rest upon, and thus the stress from the upper flange portion 7 of the members 5 can be transferred over the members 15 and 17 in such a. manner that the structure will be of suflicient strength to carry very heavy loads.

After the pairs of elements 15 and 17 have been fastened to the girders 1 preferably by welding, the purlins 5 can be dropped down upon the elements 15 and 17, in the field, so that each extremity of the web portions 10 is located between a pair of connection elements 15 and 17 (FIG. 3). The aforementioned cutting off of end sections of the web portions 10 and of lower flange portions 11 of the purlins 5 make possible not only to install the purlins 5 simply by dropping them down between the end portions of the members 15 or 17, but it also allows the securing of the elements 15 and 17 to the girders 1 at the shop, where the welding or the like can be performed more economically than in the field The purlins 5 can be securely held in place when the concrete floor (not shown) is poured, or when wood beams (not shown) or the like are placed on top of the purlins 5. Thus in a bay between two girders 1 all that has to be done is to move down the bay dropping the purlins 5 in between the connection elements 15 and 17. Although this usually will be suflicient, an even more secure fastening of the purlins 5 can be attained by forcing a wedge in between each end portion of a purlin and the connection elements 15 and 17, or by welding, or the like.

Since certain changes may be made in the above article and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which as a matter of language might be said to fall therebetween.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent is:

1. In a metal structure having a plurality of horizontal girders arranged in spaced relation to each other and having upper portions, the combination of pairs of parallel horizontal hollow longitudinal members of square crosssectional formation being in spaced relation to each other and traversely attached to the upper portions of said girders and having end portions extending beyond the same at both sides, and I-beams having upright web portions and horizontal upper and lower flange portions and being extended between said girders and supported thereon by the end portions of said hollow longitudinal members whose end portions engage the upper flange portion at both sides of the web portion at each end section of each I-beam, sections of the lower flange portions; of said I- beams opposite those sections of the upper flange portions which-are engaged by said hollow longitudinal members being removed so as to allow a dropping of the I-beams in place from above upon the end portions of said hollow longitudinal members.

2. In a purlin arrangement for steel construction, the combination of horizontal girders in spaced relation to each other having upper portions, with pairs of parallel horizontal hollow longitudinal members having flat horizontal upper and lower portions of substantial width and being in spaced relation to each other and tranversely attached to the upper portions of said girders and having end portions extending laterally beyond the same at both sides, and purlins having I-shaped main sections and T- shaped end sections with horizontal upper flange portions and vertical web portions and being extended between said girders and supported thereon by the end portionsof pairs of said hollow longitudinal members which with their flat upper portions support the upper flange portion at both sides of the web portion at each end section of each purlin.

3. In a purlin arrangement for steel construction, the combination of horizontal girders in spaced relation to each other having flat upper portions, with pairs of longitudinal members having horizontal upper and lower portions of substantial width and being traversely secured to the upper portions of said girders and laterally extended with both ends beyond the girders, and I-beams having web portions as well as upper and lower flange portions and having both ends sections of their lower flange portions removed, said ends of each I-beam being dropped between a pair of said longitudinal members so that end sections of their web portions are extended between said longitudinal members and that end sections of their upper flange portions rest upon the end portions of the horizontal longitudinal members.

4. In a metal I-beam girder structure, a purlin arrangement comprising a supporting girder, a pair of I-shaped purlins arranged oppositely and traverse of the supporting girder each having upper and lower horizontal flange portions and a web portion, and a pair of longitudinal members having horizontal upper and lower portions which are as wide as those sections of the flange portions combination of horizontal girders in spaced relation to each other having flat upper portions, with I-beamshaped purlins having web portions and horizontal upper and lower flange portions and having T-shaped end portions, and longitudinal members pre-located in pairs on and traversely secured to the upper portions of said girders and laterally extended with both ends beyond the girders and being as wide as the flange sections of said purlins at both sides of the web portion of each purlin, the members of each pair of longitudinal members being spaced from each other at a distance which is larger than the thickness of the web portion of each purlin, and the T-shaped end portions of each purlin being dropped between a pair of said longitudinal members so that end sections of their web portions are extended between said longitudinal members and that end sections of their upper flange portions rest upon the end portions of the horizontal longitudinal members.

References Cited in the file of this patent UNITED STATES PATENTS 1,780,928 Kahn Nov. 11, 1930 1,879,295 Kahn Sept. 27, 1932 FOREIGN PATENTS 626,831 Great Britain July 21, 1949 

